SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a507a09a9312f46c16a9885b7f817d2a9acda7803437aae308ed544c1a675ae' 
  AND token = 'Vzef9AagJ+qnp+K9h7B3w3tUBBpGJVMjjdUKHllNseY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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