Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b0cde0957593eb8b1ccdd6c2c45615bb07cad09aa57282c7a5fc2ab9699c4e' 
  AND token = 'xL/H511zaqEVlEGz13nfEfNYUG26/QD3f8Er5T6JrTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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