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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603c26f4e4b024684f0a796ff5224a5544098c7c314922a1b42c337e4b5a7dae' 
  AND token = '6CGIRCO+4mlCMtPWrb6gTLlz61wYsLTrP+AUbZnv/QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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