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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf477dddd0116659f103d2ed512378734d65987012ccda30611189d56a70854' 
  AND token = '31Iw2U3YoqtalQjvOjUCeDuLa0HMS+vR9hwOtOgC4Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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