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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a49a592207253dfec71fb3b79d9b6fa47c71ca421503d048e1df31d2e4f3dc' 
  AND token = 'PavD+9+lIZJv35rIC8CH6wS3oc2ERFrBcwDiQSyE9yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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