Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d7f4f3ce0f8057e0911f3b96f7f6fecf440108910be50c19b4132086c2550e' 
  AND token = 'IMpPwH31cNSRaJQxEzEPf6+XGV+NxHfsrshYHgTwpZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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