Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9be31ea568f123de9b9b6bedb544b452fa0dfa2fd0a103c952e7bbcd804e89' 
  AND token = 'Jk5L/OmkTrga/5/+GOiB0T7WDTEOHsbct/axR4qm9fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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