Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ffbb69584485f31db8c58ca8fb7d19db4094893e90c0a991518ef1704fb25e8' 
  AND token = '+O6seaBlPPiZd4ltQuUY4lOzO2MeYBuXzKN+44Bv3Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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