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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d16a570f14be26e7d9f327904830dcc935fa63f71fa7a5d5b13cbfed107082' 
  AND token = 'lXd/XoseZua4k194nmZ9DdFHH/NglNXYy012WEDwdwA=' 
  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"
    }
  }
}