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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da6b5dff379eea0ead2d6cb342eb12ecf59b66632d0baba9715644a2b8bc9f8' 
  AND token = 'H2b95urwIRdAqgGWpU6k9V+kkCienX7UEGpbGdfS8vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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