Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590029f0a2bb2a5bea47c02fbc865458c8ae8db57b2585da54d7172bac9c6675' 
  AND token = '8aQkslbhMIVeNSoxB5FY7C5SoBldkK2d9auI1FmjlnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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