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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd43f169fcf6bfeef55360d0c69169ebca0e82ab524995a40c075f2a1935d20' 
  AND token = 'UImCX43CxPpFjhUtbfhPAZ85q3fxpARM2cdRHQQ8JMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}