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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16729102a4c79719525e8e0f81138a87b506ba7d3aa23b62b76bd18c8c4f9e52' 
  AND token = 'ZO4UY/51hYke6d2JRggO0id9X7BKfBmLLZ0HsB90XzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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