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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3c9e6c7682b8476d4a01bda2eee117114cca2357d46b3dba0a8a682c79e3db' 
  AND token = 'hrLpswjsKSJ8aY7RHCVnKrJquvBAmY0URbRTzSnn24U=' 
  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"
    }
  }
}