Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58491b709b3de2a2daa2dd46c33fa90f6a56c2ed97dacea3f693202d4faf317a' 
  AND token = '1bk5iYYJVLvO5ovb5rvUYQRilfVlVKLE+rCvjE1lW2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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