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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f0b80e41873466f7ad5cf93b5f0517fed71954fb78f8e87d109e92ec5a3c6c' 
  AND token = 'Q0fAaNtbEOE2QEzc+HU0DnpjdAUnqhs0BIygRlL7LEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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