Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476306dfdcc40368b72dbf51a2f92bc389280203968c1e232d792539d5069ad5' 
  AND token = 'yDgkuRR/se0YsoxvAQX58pq60r5JKODWLYBn+SeCrRA=' 
  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"
    }
  }
}