Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476993832c20fb205b1e833703cf8c3dcc3f91ee257f04eb7cd9ec19eb6188e2' 
  AND token = '9bm7LN0fJu0xwxOj2ULidRuoT9Wa1CjGUrOQp/o6AUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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