Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecdcad3b2789b187d088b7d7db41e0ce692d6955abe30f68d868d24058b0cd4' 
  AND token = 'ZpzO8KYlIOKq6tzp3vpYtDduXsnWLEhkOmFyDk7lTAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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