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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e723d78b9795f0dc17dc3e06959fce841a51ace3279732ab6667839509e638' 
  AND token = 'lOQk0ykSvU8/PDVdpsUuQqg8Ua94s3qCOFKXFn0r6k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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