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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537f411d9f7c389ae7ad6dceab053b5166fdb2a7bd628dda7a4208b6a4a7c3b1' 
  AND token = '34+2YdmxtY5I3X9yxnNago6/sI9O0iOeH7PVKrMpP2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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