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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116b20bf13c0ea1f7ae7c0ccd44d4ba343dcb4fa78a27b9dad9ef7ee09d960e3' 
  AND token = '7G4JDwfvtspTKdoH86h9DLOfJvl9ceDWi5eZgqvC9M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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