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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c4bd96ae44d083aaa52faf0314818a7070b5ec71dc7cbcea1a45bd2f26448a' 
  AND token = 'xpZxMkqWf/zAHzycwDEHR1DJrMj55mZS15bgt4XZUFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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