Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a097016745c5cb02203a9bef29d2d2c3c8b2e2690bc43cf0dbcbfdf695fba9' 
  AND token = 'mriADkLEDI+me45uT4nARUYAFN0q4NcTN4VbeT+aFhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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