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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6d8d8b4bf3bb77e8dfc97c11a8969eaad0b146d7a04071a023bd3cd9b42a45' 
  AND token = 'YgocoH037AU9wxqLFDVd/NoELvW1miHIuNp5P3l3jTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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