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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbe8785be8dde670fb2aba58ffd9946a73e134a88a835a6d7227ca5b6f7f084' 
  AND token = 'z02sLTJ7Dj/6EaFtOrl+GHSWWPYMVoeSNDQb/jMzNZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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