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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617a44ccc7902eb920d547134f483d40d4489946efe712e5e3db30bfb82dccf8' 
  AND token = 'yqMabeTfq2MTeqkyGVY3lpIQrK5DTOXnBS5reoBMvBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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