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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5b538d74caaba3fea25f561528d7d5614facd33cd78e4c70c0f819495b03d8' 
  AND token = '1mS0GKYcefdhR7L1luQrG2PLv5hE0HHeEt4sN+uG+I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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