Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28810123062f14971a57ed1e39bc9f5d314a0b742602aa3814974c57ed0004e8' 
  AND token = '42rv1+AKsTx/tf2pC7i7LGhxwhtkFiTH3rsqnevAIgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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