Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf5169541b0a261123052f364c5b694f390cdd523b0fb9ddbd46dedd660b25c' 
  AND token = 'kmsLspSarJzICElq3d24Td0F9MtJF+UTftca2n0MTNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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