Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcb14e7f65b8787be65a2caf59d413ec057f8359f3ab678a65f9cc4aa626d15' 
  AND token = 'HLpnerFTKOwNOTJHn3nHFegfLvINUFrE/GZpDfwKo2I=' 
  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"
    }
  }
}