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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc1b634e4c50f308b6946bbfc404be15624b848c109515935cdea665e9219f5' 
  AND token = '/GiwhuUIZy/d5a/pslaHalShd8esHJl5VmTRQf1RCIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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