SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8694ba48d51f9b4f7f40bffdb661a7b82e0066f88371e55b236806a1578294' 
  AND token = '+dZYu1rhT6UENLjEI1FZMxhBPmqnZl3j5Q9dJ2G+r/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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