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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db5775c77b0364f21bb1fc84fb5948873833a2ce7cd482644b20dbc29d6b567' 
  AND token = 'PGOeby8n2GkgRvb9wbYsw2t/TEKpnhDO1FeLllR82Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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