Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6688d2f16a0e0d711fd4799f7a60cef775ccd5ffbaf960ecd0a6ff9eae1f53b7' 
  AND token = '34ik9adSu0RwJEiq3P9tu/vU8x7MX1HpO5ZSHiMoRho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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