Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b2b4ac1339a08937591f5d69ac0c6a5b4ebbe20b3df542b3aacfdcf2370a3b' 
  AND token = 'YVh0ZvIMEA1ikGnOzvIxtWcktnyt/NlmFhRW1KUUxdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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