Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97b37aee407f594c0ef624ad4b7117d2f853188990923a1f48ce86f70033bb5' 
  AND token = 'sF8GikIshfFi4nct1NA8bZMRmAKx+W++uVe3qp/mEeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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