Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377e9d52afa7820d1af3f2b9647732bd7f938d343dd8b715810b43183c113028' 
  AND token = 'dUKFKiKjgPl0ZreNgNPcCgTeWdtY5nsaMgPtryxGkg8=' 
  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"
    }
  }
}