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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e412eb1439f63cb091af54b294ff97446356cec32fc31f240ceeac7b562d87f8' 
  AND token = '3GLymu/UVN20r1WtPpgSJEzQ3y4/cTZzEYJ45gj3U40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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