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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6ac456d9eab8cdb1fd5a45bbaae93c24c412e9aea5c710418a2a3742c507ed' 
  AND token = 'ThkorcT6yPQUt/LOe9iEQCDrJgGK1mw8HA/tTn7ddww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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