Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cd0f648eb904dcc7993ecf9840113c1d9bb7124a9945727aff94223cc138fe' 
  AND token = 'kzqp1cxZE7lMnB6Ikl+TGM39Z9f7KjE4LthYgWhHPIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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