Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1ee4ccf4792dc2dbe8cc784e981e9b97c09a805d87ed9c760da1fcc6e34346' 
  AND token = 'Eif0bHxFKYYLvUsgrtuewFBWF2jw8KAYNLNZ/psBk/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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