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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04781a7599d84a50a303f88d87e607a947c0e27f155f984d85af51174214bb3d' 
  AND token = 'bluvgMfmegaxPHS4t+HUCb6L916Lp6v02SLf/0vqC9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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