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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bae57ba3e594645710182b36af30f1e915d07e16e9d9054a3607d181357397c' 
  AND token = '9bs3e8zOe48N8QoH2q4XpvFWhbAkhNcU7BXFO5pgpDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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