Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ea2486393b63a3a49734a9fa98a7dc4ca3e65fa4ed980dd66a7a34777c87cc' 
  AND token = 'wIxDv+Xp5NplHf1+TgITwHppq3ZyIQWwMAL9+3NPGMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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