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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed03adfa90f6c9461adeabea40e664717287b9164812f1cc686480c6f69df4bc' 
  AND token = 'D8slbK4pIEp9+dXqU+bdscyEXzIAAhGw946bBpBoiTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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