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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee989542582f138e2d4195f13827a49d5c11e15bb4cc9b1b28bd8b46f54c14e' 
  AND token = 'ADaXwO5mSdDpYTb/LucDx1fojcLML5A+UnglU3D2YCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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