SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b36d9b56df2038c95f40758c8c4246935f19f53a9136d0e18ff7597ace5e09' 
  AND token = '1vhDXEG/Yx+PvxALjUByEgUIEd8G7mHZJVGlNuFhJ+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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