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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d58921001c1f1d1393db68e0ecb02528781a5d5442748cfa0b2faae843fe55' 
  AND token = 'FM/YwOT3WeX/l95tVTLUY1aMV3UUlfmHSlbPl/9d7Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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