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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1cae3d2f8f7313aa555ef2bf09369aef0c436dfc72a2bddd8895c61f598b29a' 
  AND token = 'CEJX5hr6SsEDz3zL3yFVEy6jOsAuDQQDPnmyWVDAolo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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