Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5d9bacccb79dc2be36d041110ba5609242cf3166a6c2269f3a0b80c2468894' 
  AND token = 'g3Yi+7L6pkOTNBCeTy38HyMUgSLyfayOIqEVwjDIm/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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