SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd84deb8710a1cab665b1e90008654752efff23ee7d8dabac11c0a769f7d345' 
  AND token = 'FgwjI4cLczDyVaBn5VrmjKOqPRq4IUjiZKsI6xZozig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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