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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64a48e94c0eea5d5fc4ec24fc70916bbb67ec112ce86407b49cb6b16e4a8f9a' 
  AND token = 'KFLZ+ntfEaa+3N6Nf1howlJQaU/5zyLxC/tPgTgGIGs=' 
  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"
    }
  }
}