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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c2d8f3431e89dd37f8ce55cdae682c7edb72a6b19c2ae1fd71a63bd60002f0' 
  AND token = '7aFpAzs4ZZ1IVxOu8XTHeNi7EYTZhYtOzL5VkGHRfts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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