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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22b5ee5dda6a16cc19653bd66723f59caf4e27264807e17baca2eda02f92332' 
  AND token = '7Ynq9KAM9eGzlNe/tZvD5xxOCf0kggYNUOaUe1uQA/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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