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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9f5e4cd8f7450a4fb642bb8e4626c1e1cb195632c68f16b3660e196ca3bc07' 
  AND token = '6gxfxT/N6tAiLiLe8Uem3Emfl4A7DluN/gYj2aWnjKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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