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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7093b2f52ad57f2cfaf58ec4d98fb5bc177c5366e895ce5c8b1a3c0584b3d992' 
  AND token = 'BAHc7NwTQ9LcKFalwWdjrtZ5nQOz7yebevTm7Yy271M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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