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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffcd02af30cadfbac3b98a13df0ffa33f51d59f5c3f8d1cdbe8e4db37d15aeb' 
  AND token = 'pWf6RS1ogyt2dsTdvEJF27GOhqcvvMtr1uCp5TKOx4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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