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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc32c4e1f0c4979388457b730a4a5e25bd71b6ad0df71063eb69d2fc091e35f' 
  AND token = 'LrZ4FXmzZDSJXF4IfG/e0WABcIQDzmNcw/TMhXPG7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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