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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86ead0eee4480b8bf019f80fff33ef1a881032aaadf5f7e75a289669b58971e' 
  AND token = 'xXR+HlZZ9VCqKjLgnOAGAjhtQ98fQq6VL5upCtZTgeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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