SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aab07624c4518d96ccf278740c42872870a8cd92365d75e8701d8ed698a4f89' 
  AND token = '/PxyVXXFeUKx+ryyBB9QGM0CYsDKh6vOAU3PIVC1zgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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