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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875b08f3c79644e4b0744274b991832ebfcb179f2ca31a8a986554402b57a8c0' 
  AND token = 'Wt1IzHsrp1DUzbVIzyk1ZrSnHnPgTXiJFaPqi6nv66U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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