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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd471ddea88aed8197e902c292327b542cb5aa02012985869b138bd0435b7d2a5' 
  AND token = 'ni7aS7xIPbAs/mvVmvH9O/2tbRNvCHfByF7EBJCb70U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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