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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdff8bc031d0a75a75e3c0d804f129d2cda9ee93c3dbfb4bb96b41e5e2ce572' 
  AND token = '1QxemKbSTNEp8xIx6WJzO24vD9QNK2OrD8xOyHBbatU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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