Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a52847bdaaac18ab934ada001a30d910c975a4c044d27a9b463d9dc43e09b00' 
  AND token = 'j/xcGyr1U1bhp66hmbVgEEdZq1XJJRzGtkN9P9lAfis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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