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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca653d9242cd8c1927f1e92438403282eb3d538b80aef43a100f100bfd692d24' 
  AND token = 'l4H2bbEkD8qAuhGi+cREwU08PrMg1CSUhtoDW1J2pEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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