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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86544a4d73b543190399f56265a6945c0c58f17d395177d3805c257c27bfb41a' 
  AND token = 'MegeNc3aRxW4iygWAJ5mVmKuiEnwF5XyfOTllNdZLGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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