Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2122502c23463a46ed2a44cad843a242e5dc2016370857ed9d9a7777b411f38' 
  AND token = '69PLIn035iI7ogg2tHNg3bdIWrOF4h1o5AHGHrgumHk=' 
  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"
    }
  }
}