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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c435823066fd034e0b799b7bb99f24ba948002cb4bbea9de912a8b78f0e6f61a' 
  AND token = 'sUjRZ/kZZR7nZSmb/ORLHQCyLBkJYdheFfq33kYXmPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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