Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fdb0667d3968cc02955848a0c8f15d587c78f0cb8b0a80e99c067ee9241cac' 
  AND token = 'OMdZctByHTeSRNsDETE3wGJG3ODlaIQPRpI8lt+blvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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