SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85ab0b89a6e3d65fcd4d7af759fe5c1d35f9d9397e7727a2fe1cf8ce1b28aad' 
  AND token = 'TOdt+NBq64s7YK9hTaNsK96g8JpvfQKLwG4ysnKKjBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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