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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351f4fa189761be3e070cbab8bc7919f57ff61470e867d53b0ed957061e5f094' 
  AND token = '+y8/BzBK1MClLjT44OQDLR9NtHo9DL29xbjmzBMRNHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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