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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a55e87fa3d9946c4d3602f32f098e8ea5b1fa6b86d26f110aeefd8ec5a96732' 
  AND token = 'cOBh4ITbvDf2YEY418wv57yJKOi9XafGxgurPiOFa9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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