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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61cd55329828c82bc53115ef2bf86ef24cb17d169b60f6b2c9f65e5818c96b1' 
  AND token = 'Qnpjd9yj7cl89sqhNGznlQUs5Q5LGT6DRo3gHCXQ3os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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