SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4896d6d8e1208e073455548fe821d7f0763c4da2a408c123b7eb0cd9f119cf' 
  AND token = '5dHVUOqM//HSX5YGpslw67EJzLC/wtHjnEFnp0zmEnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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