Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe3e9a3af4ec83125856196128c36bdda095945c491f282f40d8379f7e86a25' 
  AND token = 'B8vfxkqWn/RkZDEzSW/NUo1E06PVIzMNjL5vP9WuR74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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