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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb6bd4675698ee45a13380307f61f536941a18ee6d527732817d51a230a88e8' 
  AND token = '4/Ss+jO/Rj0Na3EODtSxVkQdUDfudeVIrgbJ9+9t2o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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