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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d2bf1f437b7e70670289df548df5dac559eabd76d766ad135e20cc971fb05a' 
  AND token = 'CcMc7KsggwOfhaikwde8UJ2Z6JN0hx3roqzM/oD9l4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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