Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815bb16b2b0d33523bc10adc0ded0da4c0b406361dfff64673460ab68e75f139' 
  AND token = 'h/M4bQ6djePUupyCPsgyGu8RD0bm33HVJaQ6HZVcD8Q=' 
  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"
    }
  }
}