SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f82b8c50641ac347661bcab0ffff1073e732c83e93430e20ccb44c56861c62d' 
  AND token = 'jLQgoUUwM/CKc0fHsl3VAKrUhEeEYzFRt5RBOJGxU1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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