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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6cca568c6471b54977842247d4b03d4bdd10736c10d303e1b02a72685a76ac' 
  AND token = 'xL2HSoIIZc3R7Sa90wzWrveI66C/k/403VompUuLg/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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