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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893489a12260c4cc6757a2a2e498663ea9da84c9338189eaba9f90a40e08e46f' 
  AND token = 'wamGwhYdcetTG5pdkm4hPJgc3DQdvGUhJdDFJ8rQ0Kc=' 
  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"
    }
  }
}