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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f224f409d29be587f35f9c82b030a9f0dc9a7491c622a45ed723cb125b1c3e22' 
  AND token = 'Yd4BotXnDSUihLk44YRM78FZw5Y4pnOdfhkg3NslIQ4=' 
  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"
    }
  }
}